Fundamental Principles of the Cosine Rule
Fundamental Principles of the Cosine Rule
Secondary 3
In the diagram, \(BCD\) is a straight line. \(BC=10\) cm, \(AC=6\) cm and \(\cos \angle ACD = -\frac{11}{24}\).
Find
- the value of \(\cos \angle ACB\),
- the value of \(x\),
- \(\angle BAC\).
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Answer:(i) \(\frac{11}{24}\) (ii) \(9\text{ cm}\) (iii) \(80.9^\circ\)
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